A) there are always some heterozygotes carriers of the alleles
B) gene fixation occurs in populations
C) heterozygotes are at a selective advantage
D) rate of mutation to the lethal allele is high
Correct Answer: A
Solution :
The lethal gene expresses themselves only in recessive (homozygous) condition. Because the lethal gene can not express be in heierozygous condition. Thus, cannot be eliminated from population.
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